“So you can change your sex, but not your caste,” Knut said, suddenly bringing up a topic he hadn’t even touched on until now. “That’s right,” I said, a little flustered. “Our bodies are always changing, from moment to moment. In these baths the ancient Romans surely felt that. They’d have unwanted body hair plucked away, get their hair and nails cut, enjoy a massage to loosen their muscles. The body changes when we sweat in the sauna or drink water. And that’s not all. Even our brains change sex every second — depending on the book we’re reading, we become men or women. There was a library
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